HESI A2- CHEMISTRY: ATOMIC STRUCTURE AND THE

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HESI A2- CHEMISTRY: ATOMIC STRUCTURE AND THE

PERIODIC EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -30 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: An element's number of protons

Answer:

What is an ion?

Question 2: I ? Iodine, I2

Baked ? Bromine, Br2 Cookies ? Chlorine, Cl2 For ? Fluorine, F2 Our ? Oxygen, O2 New ? Nitrogen, N2 Houseguests ? Hydrogen, H2

Answer:

What are the nonmetals?

Question 3: - metalloids have multiple forms

• can be made to conduct electricity under special conditions (semiconductors)

Answer:

Properties of non-metals

Question 4: - 6 protons, 4 neutrons, and 5 electrons

Answer:

Where are protons and neutrons located?

Question 5: periods

horizontal

Answer:

Periodic table: Columns are called

Question 6: - shiny

• high electrical and thermal conductivity
• usually solids (mercury is liquid)
• usually ductile and malleable
• most have high melting points
• readily lose electrons
• low ionization

Answer:

Properties of metalloids

Question 7: Number of protons + neutrons

Answer:

Elements in the modern periodic table are arranged by increasing what?

Question 8: 30

Answer:

How many electrons does a neutral atom of nitrogen have?

• 8

• 7

• 6

• 5

Question 9: A negatively charged ion with more electrons than protons

Answer:

What is an isotope?

Question 10: outside the nucleus, they orbit the nucleus

Answer:

Which element is located in both Group 2 and Period 4?

• Potassium
• Magnesium
• Calcium
• Barium

Question 11: A positively charged ion with more protons than electrons

Answer:

What is an anion? :(

Question 12: - usually poor conductors of heat and electricity

• often liquids or gases at room temperature and pressure
• lack metallic luster (not shiny)
• readily gain electrons - high ionization energy

Answer:

Which of the following is a property of noble gases?

• They are highly reactive
• They are easily ionized
• They have a -1 charge
• They have a full octet of valence electrons

Question 13: As

Answer:

How many neutrons are in germanium-62?

• 30
• 31
• 32
• 62

Question 14: Atoms with the same number of protons and electrons, but a different number of neutrons

Answer:

Which of the following isotopes of iron has 26 protons, 30 neutrons, and 26 electrons?

• 30Fe
• 55Fe
• 26Fe
• 56Fe

Question 15: atomic number

Answer:

Periodic table: Rows are called

Question 16: number of valence electrons

Answer:

What is the identity of an atom?

Question 17: number of protons

Answer:

What is the atomic mass?

Question 18: They have a full octet of valence electrons

Answer:

Which of the following is the correct symbol for arsenic?

• At
• As
• Ar
• Al

Question 19: Element

Answer:

What is the atomic number?

Question 20: 56Fe

26 + 30 = 56

Answer:

Which of the following represents an ion?

• 6 protons, 4 neutrons, and 5 electrons